CN112166629A - User terminal - Google Patents

Abstract

A user terminal according to an aspect of the present disclosure includes: a control unit that decides, based on a predetermined condition, a step size of a PH value per increment of an index related to a PH (Power Headroom) or a range of a PH value corresponding to the index; and a transmission unit that transmits a PHR (Power Headroom Report) including the index. According to an aspect of the present disclosure, it is possible to report an appropriate PH in a future wireless communication system.

Description

User terminal

Technical Field

The present disclosure relates to a user terminal in a next generation mobile communication system.

Background

In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) is standardized for the purpose of higher data rate, lower latency, and the like (non-patent document 1). In addition, LTE-a (LTE-Advanced, LTE rel.10, 11, 12, 13) is standardized for the purpose of further large capacity, Advanced, and the like of LTE (LTE rel.8, 9).

Successor systems of LTE are also investigated (e.g. also referred to as FRA (Future Radio Access)), 5G (fifth generation mobile communication system), 5G + (plus), NR (New Radio), NX (New Radio Access), FX (Future generation Radio Access), LTE rel.14 or 15 and beyond, etc.).

In conventional LTE (e.g., LTE rel.8-13), a User terminal (User Equipment (UE)) feeds back a Power Headroom Report (PHR) including information on an uplink Power Headroom (PH) for each serving cell to a device (e.g., a base station) on the network side.

The base station determines the uplink transmission Power of the UE based on the PHR, and notifies the UE of a Transmit Power Control (TPC) command so that the appropriate uplink transmission Power is achieved.

Documents of the prior art

Non-patent document

Non-patent document 13 GPP TS 36.300V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In future wireless communication systems (e.g., NR), PHR is also supported as in LTE.

However, in NR, a desirable range of the value (PH, etc.) reported by PHR is assumed to be larger than that in the case of LTE. If the mapping of the index indicated by the field included in the PHR and the value such as the PH is similar to that in LTE, a sufficient range cannot be expressed. In this case, there is a problem that appropriate transmission power control cannot be performed, and communication throughput, communication quality, and the like deteriorate.

Therefore, an object of the present disclosure is to provide a user terminal capable of reporting an appropriate PH in a future wireless communication system.

Means for solving the problems

A user terminal according to an aspect of the present disclosure includes: a control unit that decides, based on a predetermined condition, a step size of a PH value per increment of an index related to a PH (Power Headroom) or a range of a PH value corresponding to the index; and a transmission unit that transmits a PHR (Power Headroom Report) including the index.

Effects of the invention

According to an aspect of the present disclosure, it is possible to report an appropriate PH in a future wireless communication system.

Drawings

Fig. 1 is a diagram showing an example of PHR MAC CE in NR.

Fig. 2 is a diagram showing an example of the multi-entry PHR MAC CE in NR.

Fig. 3A and 3B are diagrams illustrating an example of a PHR MAC CE according to an embodiment.

Fig. 4 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 5 is a diagram showing an example of the overall configuration of a radio base station according to an embodiment.

Fig. 6 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment.

Fig. 7 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment.

Fig. 8 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment.

Fig. 9 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to an embodiment.

Detailed Description

In NR, PHR is also supported as in LTE. The PHR may also be transmitted through MAC (Medium Access Control) signaling using a PUSCH (Physical Uplink Shared Channel). For example, the PHR is notified using a PHR MAC CE (Control Element) included in a MAC PDU (Protocol Data Unit).

Fig. 1 is a diagram showing an example of PHR MAC CE in NR. Fig. 1 corresponds to a single entry PHR MAC CE (single entry PHR MAC CE). The MAC CE is being studied to be composed of 2 octets (═ 16 bits). 'R' of fig. 1 respectively indicates reserved fields of 1 bit, for example, a value set to '0'.

'PH (type X), PCell)' of fig. 1 denotes a 6-bit field, for example, an index related to the type X PH of PCell (Primary Cell). The index associated with the PH is associated with a particular PH level (dB). For example, type 1PH may be PH in which PUSCH is considered (for example, only PUSCH is considered), type 2PH may be PH in which PUCCH is considered (for example, PUSCH and PUCCH are considered), and type 3PH may be PH in which a measurement Reference Signal (Sounding Reference Signal) is considered (for example, PUSCH and SRS are considered).

'P' of FIG. 1_CMAX，c1' represents a 6-bit field indicating P used for the calculation of the PH field_CMAX，cThe associated index. And the P_CMAX，cThe associated index is associated with a specific UE transmit power level (dB). In addition, P_CMAX，cIt may also be referred to as the maximum transmission power (maximum allowed transmission power) of the UE in the serving cell c.

In addition, in the NR, a multi-entry PHR MAC CE (multiple entry PHR MAC CE) containing a plurality of data similar to the above-described single entry (2 octets) is also supported. Fig. 2 is a diagram showing an example of the multi-entry PHR MAC CE in NR.

The 'R' of fig. 2 is the same reserved field as fig. 1. The 6-bit field of fig. 2 containing the term 'PH' indicates a corresponding type and a PH field of a Cell (PCell, PSCell (Primary-Secondary Cell)), PUCCH-SCell, SCell), respectively.

FIG. 2 contains ` P `_CMAX，cThe 6-bit field of this term is P indicating the calculation used for the immediately preceding PH field_CMAX，cP of_CMAX，cA field. ' C of FIG. 2_i' is a field indicating whether or not the PH field of the SCell corresponding to the SCell index i is included in the PHR.

'V' of fig. 2 is a field indicating whether a PH value corresponding to the immediately subsequent PH field is based on actual transmission (V ═ 1) or reference format (V ═ 0). A PH based on a reference format may also be referred to as a virtual PH (virtual PH). In addition, when V is 0, the corresponding' P ═ P_CMAX，cThe' field may also be omitted (omit).

However, in NR, a millimeter Wave (mmW) having a wavelength of about 1mm to 10mm is supported. The millimeter-wave band domain may also be referred to as EHF (extreme High Frequency).

The Frequency bands higher than 24GHz (above 24GHz) and/or the mmW band may also be referred to as FR 2(Frequency Range 2). Further, a Frequency lower than 6GHz (lower than 6GHz) may also be referred to as FR 1(Frequency Range 1). The band used in conventional LTE (e.g., LTE rel.8-14) corresponds to FR 1.

For FR1, the maximum transmission Power may also be specified using the Total Radiated Power (TRP). The maximum transmission power referred to herein is, for example, P which is the maximum transmission power (maximum allowable transmission power) of the UE_CMAXThe above-mentioned P_CMAX，cAnd the like.

As for FR2, it is under study to specify the maximum transmission Power using Effective Isotropic Radiated Power (EIRP) or Effective Radiated Power (Effective Radiated Power). For example, in 3GPP TS 38.101-2V15.0.0(2017-12) Table 6.2.1-2, 43dBm is described based on EIRP as the maximum UE transmission power of FR 2. Thus, in FR2, P_CMAX，P_CMAX，cEtc. are assumed to be larger than FR 1.

In LTE, the PH related index contained in the PHR can take values from 0 to 63, with 0 corresponding to-23 dB < PH < -22dB, 1 corresponding to-22 dB < PH < 21dB, … …, 62 corresponding to 39dB < PH < 40dB, and 63 corresponding to 40dB < PH.

In LTE, PHR includes a group of atoms and P_CMAX，cThe associated index can take values from 0 to 63, with 0 corresponding to P_CMAX，cLess than-29 dBm, with an index of-1 corresponding to-29 dBm ≦ P_CMAX，c< -28dBm, … …, index 62 corresponding to 32dBm ≦ P_CMAX，c< 33dBm, index 63 corresponds to 33dBm ≦ P_CMAX，c。

That is, in LTE, the range of PH values that can be reported (range) is-23 dB to 40dB, and the step size (resolution) of the PH value per index increment is 1 dB. In addition, a reportable P_CMAX，cThe range of values (range) of-29 dBm to 33dBm, the step size of PH per index increment is 1 dBm.

As described above, among NR, PH and P_CMAX、P_CMAX，cEtc. are assumed to be larger than in the case of LTE. However, if pH and/or P are assumed_CMAX，cThe step size of (2) is 1db (dbm) as in LTE, and a sufficient range cannot be expressed by the 6-bit field of the PHR. In this case, there is a problem that appropriate transmission power control cannot be performed, and communication throughput, communication quality, and the like deteriorate.

Therefore, the inventors of the present invention have conceived of a method for appropriately switching PH and P reported by a PHR MAC CE_CMAX，cStep size and/or range of at least one value of (a).

Hereinafter, the embodiments will be described in detail with reference to the drawings. The radio communication methods according to the respective embodiments may be applied individually or in combination.

In the following description, the PHR is transmitted using the MAC CE, but the invention disclosed in the present disclosure is not limited to this. For example, when the PHR is transmitted using another signaling, the following embodiments can be applied. In this case, the PHR MAC CE may also be interpreted as other signaling.

Here, the other signaling may be higher layer signaling, physical layer signaling (for example, Downlink Control Information (DCI)), or a combination thereof.

For example, RRC (Radio Resource Control) signaling, MAC signaling, broadcast Information (e.g., MIB (Master Information Block), SIB (System Information Block)), and the like may be used for the higher layer signaling.

In the following, when the step size, the range, and the like are not particularly described, the unit is described as a more appropriate unit in dB or dBm. For example, the case where the step size is X may mean that the step size is xddb with respect to PH, or P may mean that P is P_CMAX，cAnd the step size is XdBm. The unit may correspond to a unit other than dB or dBm.

In the following description, the description is made from the viewpoint of switching step size for simplicity, but it is understood by those skilled in the art that the range changes as the step size changes. The "step" in the present specification may also be interpreted as "range", "step and at least one of range", and the like. The subject of the step size and the range of values may be the UE and/or the base station.

(Wireless communication method)

In an embodiment, the UE and/or the base station may determine (may switch between using) the PH and the P reported by the PHR MAC CE based on at least one of the following_CMAX，cStep size of at least one of:

(1) a specific bit of the PHR MAC CE,

(2) the band in use is in the region of,

(3) PH or P_CMAX，cThe value of (a) is,

(4) UE Capability (UE Capability),

(5) the maximum transmission power set for the cell group,

(6) explicit notification.

< (1) PHR MAC CE-based determination of specific bit

For the above (1), the specific bit of the PHR MAC CE may also be one or more of the four R fields shown in fig. 1, for example. For example, when one R field is used as the step field indicating the step size, if the value of the field is 0, the step size may be assumed to be the first value (for example, 1), and if the value of the field is 1, the step size may be assumed to be the second value (for example, 2).

P_CMAX，cAnd PH may also be respectively designated with a step size using one or two of the two R fields preceding each. That is, the PHR MAC CE may include P_CMAX，cA step size field for PH and a step size field for PH.

In the present specification, the step size of the pH value, and P_CMAX，cThe step size of the value of (c) may be different or the same. For example, in the present specification, the first value related to the step size of the PH value may be related to P_CMAX，cThe step size of the value of (a) is different from the associated first value. The same applies to the second value.

P_CMAX，cAnd PH may also represent (sum) the step size specified for a field. That is, the PHR MAC CE may include P_CMAX，cStep size field for PH. In this case, the meaning of one step field may be in P_CMAX，cAnd PH are interpreted differently. Further, in the case of designation by representation, the step field may also be applied to P_CMAX，cAnd PH, may be applied to only one.

Among the four R fields shown in fig. 1, a plurality of fields may be concatenated to mean one step size field. In the example of fig. 1, the step size field may be 4 bits at maximum.

In the case where the step field is 0, it can also be assumed to be P_CMAX，cIs 23dBm, and when the step field is 1, P can be assumed as the maximum value of (d)_CMAX，cThe maximum value of (d) is 43 dBm.

Fig. 3A and 3B are diagrams illustrating an example of a PHR MAC CE according to an embodiment. Alternatively, as shown in FIG. 3A, R may be located before the PH fieldOne of the fields is used as an 'S' (step size) field. Alternatively, as shown in fig. 3B, one of the R fields preceding the PH field may be used as the step field for PH, and is located at P_CMAX，cOne of the R fields before the field is used as P_CMAX，cThe step size field used.

< (2) decision based on band in use

In the above (2), P may be determined based on the band in use_CMAX，cAnd PH, only one of the steps may be determined.

For example, if the band in use is the first band (for example, FR1), the step size may be assumed to be the first value (for example, 1), and if the band in use is the second band (for example, FR2), the step size may be assumed to be the second value (for example, 2).

In addition, P_CMAX，cThe maximum value of (b) may be the maximum transmission power by EIRP or a value based on the maximum transmission power (for example, a value obtained by applying a predetermined offset value to the maximum transmission power) specified by 3GPP TS 38.101-2 or the like.

Here, "band" can also be interpreted as "RAT (Radio Access Technology)", "Carrier frequency", "Component Carrier (CC)," band "," frequency resource ", BandWidth Part (BWP: BandWidth Part), and the like. BWP may also be referred to as partial band, etc.

< (3) based on PH or P_CMAX，cDetermination of the value of (1) >)

In the above (3), P in PHR MAC CE may be the basis_CMAX，cThe value of (c) determines the step size of the PH. For example, if P_CMAX，c≦ the first threshold (e.g., 23dBm), then it may also be determined as step size ≦ the first value (e.g., 2), if P_CMAX，cIf > the first threshold, the step size may be determined to be a second value (e.g., 1).

The PH step size may not be based on P_CMAX，cIs (independently) determined. For example, if PH ≦ the second threshold (e.g., 10dB), it may be determined that the step size is equal to the first value (e.g., 1), and if PH > the second threshold,it can also be decided that the step size is the second value (e.g., 2). This is because a case where the PH is large means that the transmission power is small, and when the transmission power is small, even if the PH is roughly reported, the influence of the error of the PH is small (can be appropriately controlled).

It can also be based on P in PHR MAC CE_CMAX，cIs determined from the value of (1), P_CMAX，cStep size of itself. For example, if P_CMAX，c≦ third threshold (e.g., 23dBm), then it may also be determined as step size ≦ first value (e.g., 2), if P_CMAX，cIf the step size is greater than the third threshold, the step size may be determined to be a second value (e.g., 1).

In addition, with respect to PH (or P)_CMAX，c) In the case of a range in which the value of (b) is relatively large, the step size may be determined to be larger than that in the case of a smaller range, or conversely, the step size may be determined to be smaller.

< (4) UE Capability based decision >

In relation to (4) above, P may be determined based on UE capability_CMAX，cAnd PH, only one of the steps may be determined. The UE capability may also be, for example, a UE power class (UE power class).

For example, the UE Power level may be determined to be the first value (e.g., 1) if the UE Power level is the first Power level (e.g., Power class x1), and may be determined to be the second value (e.g., 2) if the UE Power level is the second Power level (e.g., Power class x 2).

In addition, P_CMAX，cThe maximum value of (b) may be the maximum transmission power of the UE power class specified by 3GPP TS 38.101 or a value based on the maximum transmission power (for example, a value obtained by applying a predetermined offset value to the maximum transmission power).

Here, the UE capability may also be interpreted as a UE type (UE type). The UE type may also include at least one of:

a Handheld terminal (Handheld UE),

customer premises Equipment (Customer-Provided Equipment (CPE)),

a smart phone, which is connected to the mobile phone,

a Laptop computer (Laptop computer) mounted machine (e.g., a plug-in device such as a Universal Serial Bus (USB) dongle (dongle)),

a machine (Laptop embedded) embedded in a notebook computer,

a tablet computer, the tablet computer being,

-a wearable device for the wearable device,

a vehicle-mounted device (Vehicular mounted device),

fixed Wireless Access (FWA) terminals,

fixedly mounted devices (Fixed mounted devices) (e.g., sensors, robots).

< (5) decision based on maximum transmission power set for cell group

In the case where a plurality of Cell Groups (CGs) are set for the UE in the above (5), P may be determined based on the parameter of the maximum transmission power set for each CG_CMAX，cAnd PH, only one of the steps may be determined.

Here, the maximum transmission power set for each CG may be, for example, P-MCG related to MCG, P-SCG related to SCG, or the like. In addition, not limited to the case of 2CG, when the number of CGs is 3 or more, P may be determined based on a parameter of maximum transmission power set for each CG_CMAX，cAnd/or a step size of PH.

The CG may be a Group related to one or more cells, and may be interpreted as a PUCCH Group, a TAG (Timing Advance Group), or the like.

< (6) explicit notification-based decision >

In the above (6), P may be determined based on an explicit notification_CMAX，cAnd PH, only one of the steps may be determined. The explicit notification may also include information about the step size and/or range, and may also be notified to U through higher layer signaling (e.g., RRC signaling, SIB, etc.), physical layer signaling (e.g., DCI), or a combination thereofE。

The step size information can also be P_CMAX，cAnd different PH information, and may be notified as P_CMAX，cAnd the PH common information.

The information of the step size and/or the range may be specified by at least one unit such as CG unit, node unit, base station unit, CC unit, UL unit (e.g., SUL (Supplementary Uplink) unit and/or Non-SUL (Non-Supplementary Uplink)) unit), PH type unit, BWP unit, and the like. The term "unit of unit" herein may mean "independently for each (unit)".

For example, the Information of the step size and/or the range may be set for each CG, including a CG setting Information Element (CellGroupConfig IE) in RRC signaling. The information of the step size and/or the range may be included in a BWP configuration information element (bandwidth _ match _ Config IE) of the RRC signaling, and may be configured for each BWP.

The default step size and/or range may also be specified by a specification or may be signaled (e.g., higher layer signaling, physical layer signaling). When the UE receives the explicit step size and/or range information, a default value may be rewritten based on the information, or a value indicated by the information may be used instead of the default value.

According to the above-described embodiment of the present disclosure, even when the range of the maximum transmission power of the UE is extended, the PHR can be appropriately reported, and flexible transmission power control can be performed.

< modification example >

The above-described embodiment is not limited to the application to a single target PHR, and may be applied to other PHR. For example, when the above (1) is applied to the multi-entry PHR MAC CE, the step size field may be configured using one or more P, V, R fields of fig. 2.

Further, the step size and/or range specified for a particular cell (e.g., PCell) may also be used for other cells (e.g., PSCell, PUCCH-SCell, SCell).

PH and/or P may be determined based on two or more of the above-mentioned (1) to (6)_CMAX，_c. For example, the smaller (or larger) step size may be determined using the step size determined based on the band in use and the step size determined based on the UE capability, taking into consideration the above (2) and (4).

The condition for deciding (switching) the step size in the above-described embodiment may be used for the PH field and/or P, together with or instead of the step size, the range, and the like_CMAX，cInterpretation of the bit size of the field itself.

For example, the PH field and/or P may be set based on at least one of the above-mentioned (1) to (6)_CMAX，cThe size of the field is switched between a plurality of bit sizes. For example, the plurality of bit sizes may be 6, 7, and 8 bits. The plurality of bit sizes may include a number of bits smaller than 6 bits, or may include a number of bits larger than 8 bits.

In addition, the PH field and/or the P are extended using at least a part of the P, V, R field in the PHR MAC CE as shown in fig. 1 and 2, which has been proposed conventionally_CMAX，cIn the case of fields, these fields may also be non-consecutive fields. For example, extensions to the PH field may also use P_cmax，cThe immediately preceding R field of (2), and may also be for P_cmax，cThe extension of the field uses the immediately preceding R field of the PH.

The step size and/or the range may be set independently for each cell, or may be set independently for each BWP (carrier f).

The above-described embodiments can also be applied to any PHR of an uplink signal. In the above-described embodiment, the setting/specification may be performed in common for a plurality of uplink signals, or may be performed in dedicated for each uplink signal. For example, the step size and/or the range may be set differently for each transmission signal such as PUCCH, PUSCH, SRS, and the like.

In the above-described embodiment, the step size or the range is determined (switched), but may be determined in addition to or instead of this(also switchable) representation index and PH or P_CMAX，cTable of the corresponding relationship of (1).

Different steps, ranges or tables are used for PH/P_CMAX，cCalculating this can also be decided by LCID (logical Channel id) contained in the MAC header (more precisely, MAC subheader). That is, when the MAC PDU includes the first LCID, it may indicate that the PHR MAC CE corresponding to the first table is notified, and when the MAC PDU includes the second LCID, it may indicate that the PHR MAC CE corresponding to the second table is notified.

In the above-described embodiment, an example in which the step size is switched in 2 steps according to the condition is shown, and the step size may be switched in 3 steps or more.

(Wireless communication System)

Hereinafter, a configuration of a radio communication system according to an embodiment of the present disclosure will be described. In this radio communication system, communication is performed using one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.

Fig. 4 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. In the wireless communication system 1, Carrier Aggregation (CA) and/or Dual Connectivity (DC) can be applied in which a plurality of basic frequency blocks (component carriers) are integrated into one unit of 1 system bandwidth (e.g., 20MHz) of the LTE system.

The wireless communication system 1 may be referred to as LTE (Long Term Evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), and the like, and may also be referred to as a system that implements them.

The wireless communication system 1 includes a radio base station 11 forming a macrocell C1 having a relatively wide coverage area, and radio base stations 12(12a to 12C) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. In addition, the user terminal 20 is arranged in the macro cell C1 and each small cell C2. The arrangement, number, and the like of each cell and user terminal 20 are not limited to the illustrated embodiments.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. The user terminal 20 contemplates using both macro cell C1 and small cell C2 with CA or DC. The user terminal 20 may apply CA or DC using a plurality of cells (CCs) (e.g., 5 or less CCs or 6 or more CCs).

The user terminal 20 and the radio base station 11 can communicate with each other using a carrier having a narrow bandwidth (also referred to as an existing carrier, legacy carrier, or the like) in a relatively low frequency band (e.g., 2 GHz). On the other hand, a carrier having a relatively high bandwidth (e.g., 3.5GHz, 5GHz, etc.) may be used between the user terminal 20 and the radio base station 12, or the same carrier as that used between the radio base station 11 may be used. The configuration of the frequency band used by each radio base station is not limited to this.

The user terminal 20 can perform communication in each cell by using Time Division Duplex (TDD) and/or Frequency Division Duplex (FDD). In addition, a single parameter set may be applied to each cell (carrier), or a plurality of different parameter sets may be applied.

The parameter set (Numerology) may also be a communication parameter applied to Transmission and/or reception of a certain signal and/or channel, and may also indicate at least one of subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, subframe length, Transmission Time Interval (TTI) length (e.g., slot length), number of symbols per TTI, radio frame structure, filtering process, windowing process, and the like, for example.

The connection between the Radio base station 11 and the Radio base station 12 (or between the two Radio base stations 12) may be wired (for example, an optical fiber conforming to a Common Public Radio Interface (CPRI), an X2 Interface, or the like) or wireless.

The radio base station 11 and each radio base station 12 are connected to the upper station apparatus 30, and are connected to the core network 40 via the upper station apparatus 30. The upper node apparatus 30 includes, for example, an access gateway apparatus, a Radio Network Controller (RNC), a Mobility Management Entity (MME), and the like, but is not limited thereto. Each radio base station 12 may be connected to the upper station apparatus 30 via the radio base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage area, and may be referred to as a macro base station, a sink node, an enb (enodeb), a transmission/reception point, or the like. The Radio base station 12 is a Radio base station having a local coverage area, and may be referred to as a small base station, a micro base station, a pico base station, a femto base station, an HeNB (home evolved node b), an RRH (Remote Radio Head), a transmission/reception point, or the like. Hereinafter, the radio base stations 11 and 12 are collectively referred to as the radio base station 10 without distinguishing them.

Each user terminal 20 is a terminal supporting various communication schemes such as LTE and LTE-a, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

In the wireless communication system 1, as a radio Access scheme, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to a downlink, and Single Carrier Frequency Division Multiple Access (SC-FDMA) and/or OFDMA is applied to an uplink.

OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier to perform communication. SC-FDMA is a single-carrier transmission scheme in which a system bandwidth is divided into bands each composed of one or consecutive resource blocks for each terminal, and a plurality of terminals use different bands to reduce interference between terminals. The uplink and downlink radio access schemes are not limited to the combination thereof, and other radio access schemes may be used.

In the radio communication system 1, as Downlink channels, Downlink Shared channels (PDSCH: Physical Downlink Shared Channel), Broadcast channels (PBCH: Physical Broadcast Channel), Downlink L1/L2 control channels, and the like, which are Shared by the user terminals 20, are used. User data, higher layer control Information, SIB (System Information Block), and the like are transmitted through the PDSCH. Also, MIB (Master Information Block) is transmitted through PBCH.

The Downlink L1/L2 Control Channel includes PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like. Downlink Control Information (DCI) including scheduling Information of the PDSCH and/or the PUSCH and the like are transmitted through the PDCCH.

In addition, the scheduling information may be notified through DCI. For example, DCI scheduling DL data reception may be referred to as DL assignment (DL assignment), and DCI scheduling UL data transmission may be referred to as UL grant (UL grant).

The number of OFDM symbols for PDCCH is transmitted through PCFICH. Transmission acknowledgement information (for example, also referred to as retransmission control information, HARQ-ACK, ACK/NACK, and the like) of HARQ (Hybrid Automatic Repeat reQuest) for PUSCH is transmitted by PHICH. EPDCCH and PDSCH (downlink shared data channel) are frequency division multiplexed, and used for transmission of DCI and the like in the same manner as PDCCH.

In the radio communication system 1, as Uplink channels, an Uplink Shared Channel (PUSCH), an Uplink Control Channel (PUCCH), a Random Access Channel (PRACH), and the like, which are Shared by the user terminals 20, are used. Through the PUSCH, user data, higher layer control information, and the like are transmitted. In addition, downlink radio Quality information (Channel Quality Indicator (CQI)), acknowledgement information, Scheduling Request (SR), and the like are transmitted through the PUCCH. Through the PRACH, a random access preamble for establishing a connection with a cell is transmitted.

In the wireless communication system 1, as downlink Reference signals, Cell-specific Reference signals (CRS), Channel State Information Reference signals (CSI-RS), DeModulation Reference signals (DMRS), Positioning Reference Signals (PRS), and the like are transmitted. In addition, in the wireless communication system 1, as the uplink Reference Signal, a measurement Reference Signal (SRS: Sounding Reference Signal), a demodulation Reference Signal (DMRS), and the like are transmitted. The DMRS may be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal). Further, the reference signals transmitted are not limited to these.

(radio base station)

Fig. 5 is a diagram showing an example of the overall configuration of a radio base station according to an embodiment. The radio base station 10 includes a plurality of transmission/reception antennas 101, an amplifier unit 102, a transmission/reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission line interface 106. The transmission/reception antenna 101, the amplifier unit 102, and the transmission/reception unit 103 may be configured to include one or more antennas.

User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the upper station apparatus 30 to the baseband signal processing unit 104 via the transmission line interface 106.

In baseband signal processing section 104, with respect to user Data, transmission processes such as PDCP (Packet Data Convergence Protocol) layer processing, user Data division/combination, RLC (Radio Link Control) layer transmission processing such as RLC retransmission Control, MAC (Medium Access Control) retransmission Control (for example, HARQ transmission processing), scheduling, transport format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed, and the user Data is transferred to transmission/reception section 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast fourier transform, and transferred to transmission/reception section 103.

Transmission/reception section 103 converts the baseband signal output from baseband signal processing section 104 by precoding for each antenna to the radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission/reception section 103 is amplified by the amplifier section 102 and transmitted from the transmission/reception antenna 101. The transmitting/receiving section 103 can be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present disclosure. The transmission/reception section 103 may be configured as an integrated transmission/reception section, or may be configured by a transmission section and a reception section.

On the other hand, for the uplink signal, the radio frequency signal received by the transmission/reception antenna 101 is amplified by the amplifier unit 102. Transmission/reception section 103 receives the uplink signal amplified by amplifier section 102. Transmitting/receiving section 103 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to baseband signal processing section 104.

The baseband signal processing section 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction decoding, reception processing for MAC retransmission control, and reception processing for the RLC layer and the PDCP layer on the user data included in the input uplink signal, and transfers the user data to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, and the like) of a communication channel, state management of the radio base station 10, management of radio resources, and the like.

The transmission line interface 106 transmits and receives signals to and from the upper station apparatus 30 via a predetermined interface. The transmission path Interface 106 may transmit and receive signals (backhaul signaling) to and from other Radio base stations 10 via an inter-base station Interface (e.g., an optical fiber compliant with a Common Public Radio Interface (CPRI), or an X2 Interface).

Further, the transmission/reception section 103 may further include an analog beamforming section for performing analog beamforming. The analog beamforming unit may be configured by an analog beamforming circuit (e.g., a phase shifter or a phase shift circuit) or an analog beamforming device (e.g., a phase shifter) described based on common knowledge in the art of the present disclosure. The transmission/reception antenna 101 may be formed of an array antenna, for example.

Transmission/reception section 103 may also receive a PHR and the like. Transmission/reception section 103 may transmit information on the step size and/or range, TPC command, and the like to user terminal 20.

Fig. 6 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment. In this example, the functional blocks mainly representing the characteristic parts in the present embodiment are assumed to be provided in the radio base station 10 as well as other functional blocks necessary for radio communication.

The baseband signal processing section 104 includes at least a control section (scheduler) 301, a transmission signal generation section 302, a mapping section 303, a reception signal processing section 304, and a measurement section 305. These components may be included in radio base station 10, or a part or all of the components may not be included in baseband signal processing section 104.

The control unit (scheduler) 301 performs overall control of the radio base station 10. The control unit 301 may be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present disclosure.

The control unit 301 controls, for example, generation of a signal in the transmission signal generation unit 302, allocation of a signal in the mapping unit 303, and the like. Further, the control unit 301 controls reception processing of signals in the received signal processing unit 304, measurement of signals in the measurement unit 305, and the like.

Control section 301 controls scheduling (e.g., resource allocation) of system information, a downlink data signal (e.g., a signal transmitted via PDSCH), and a downlink control signal (e.g., a signal transmitted via PDCCH and/or EPDCCH. Control section 301 controls generation of a downlink control signal, a downlink data signal, and the like based on the result of determining whether retransmission control for an uplink data signal is necessary or not, and the like. Further, control section 301 controls scheduling of Synchronization signals (e.g., PSS (Primary Synchronization Signal)/SSS (Secondary Synchronization Signal)), downlink reference signals (e.g., CRS, CSI-RS, DMRS), and the like.

Further, control section 301 controls scheduling of an uplink data signal (e.g., a signal transmitted on the PUSCH), an uplink control signal (e.g., a signal transmitted on the PUCCH and/or the PUSCH, acknowledgement information, etc.), a random access preamble (e.g., a signal transmitted on the PRACH), an uplink reference signal, and the like.

Control section 301 may also perform control for transmitting information for transmission power control to user terminal 20. Control section 301 may also perform control for transmitting information used for the above-described transmission power control based on the PHR received from user terminal 20.

The control unit 301 may also determine a step size of a PH value per increment of an index (PH field) related to a PH or a range of PH values corresponding to the index based on a predetermined condition. Control section 301 may determine P based on a predetermined condition_CMAX，cRelative index (P)_CMAX，cFields) per increment of P_CMAX，cStep size of the value of (a) or P corresponding to the index_CMAX，cA range of values of (c). These predetermined conditions may be the determination conditions shown in (1) to (6) of the above-described embodiment.

Transmission signal generating section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, and the like) based on an instruction from control section 301, and outputs the downlink signal to mapping section 303. The transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common knowledge in the technical field of the present disclosure.

Transmission signal generating section 302 generates, for example, a DL assignment notifying assignment information of downlink data and/or an UL grant notifying assignment information of uplink data, based on an instruction from control section 301. Both DL allocation and UL grant are DCI, and comply with DCI format. The downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on Channel State Information (CSI) and the like from each user terminal 20.

Mapping section 303 maps the downlink signal generated by transmission signal generating section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs the result to transmitting/receiving section 103. The mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common knowledge in the technical field related to the present disclosure.

Received signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmission/reception section 103. Here, the reception signal is, for example, an uplink signal (an uplink control signal, an uplink data signal, an uplink reference signal, or the like) transmitted from the user terminal 20. The reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present disclosure.

The received signal processing unit 304 outputs information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, the HARQ-ACK is output to control section 301. Further, the received signal processing unit 304 outputs the received signal and/or the signal after the reception processing to the measurement unit 305.

The measurement unit 305 performs measurements related to the received signal. The measurement unit 305 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present disclosure.

For example, measurement section 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, and the like based on the received signal. Measurement section 305 may also perform measurement of Received Power (for example, RSRP (Reference Signal Received Power)), Received Quality (for example, RSRQ (Reference Signal Received Quality)), SINR (Signal to Interference plus Noise Ratio)), SNR (Signal to Noise Ratio)), Signal Strength (for example, RSSI (Received Signal Strength Indicator)), propagation path information (for example, CSI), and the like. The measurement result may also be output to the control unit 301.

(user terminal)

Fig. 7 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment. The user terminal 20 includes a plurality of transmission/reception antennas 201, an amplifier unit 202, a transmission/reception unit 203, a baseband signal processing unit 204, and an application unit 205. The transmission/reception antenna 201, the amplifier unit 202, and the transmission/reception unit 203 may be configured to include one or more antennas.

The radio frequency signal received by the transmission and reception antenna 201 is amplified by the amplifier unit 202. Transmission/reception section 203 receives the downlink signal amplified by amplifier section 202. Transmitting/receiving section 203 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to baseband signal processing section 204. The transmitting/receiving section 203 can be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present disclosure. The transmission/reception unit 203 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit.

Baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing of retransmission control, and the like on the input baseband signal. The downlink user data is forwarded to the application unit 205. The application section 205 performs processing and the like relating to layers higher than the physical layer and the MAC layer. Furthermore, the broadcast information among the data, which may also be downlink, is also forwarded to the application unit 205.

On the other hand, uplink user data is input from the application section 205 to the baseband signal processing section 204. Baseband signal processing section 204 performs transmission processing for retransmission control (e.g., transmission processing for HARQ), channel coding, precoding, Discrete Fourier Transform (DFT) processing, IFFT processing, and the like, and transfers the result to transmitting/receiving section 203. Transmission/reception section 203 converts the baseband signal output from baseband signal processing section 204 into a radio frequency band and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmission/reception section 203 is amplified by the amplifier section 202 and transmitted from the transmission/reception antenna 201.

Further, transmission/reception section 203 may further include an analog beamforming section for performing analog beamforming. The analog beamforming unit may be configured by an analog beamforming circuit (e.g., a phase shifter or a phase shift circuit) or an analog beamforming device (e.g., a phase shifter) described in common knowledge in the art of the present disclosure. The transmission/reception antenna 201 may be formed of an array antenna, for example.

The transmission/reception section 203 may transmit a PHR and the like. The transmission/reception unit 203 may also receive information on the step size and/or range, TPC commands, and the like from the radio base station 10.

Fig. 8 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment. In this example, the functional blocks mainly representing the characteristic parts in the present embodiment are assumed to be provided in addition to other functional blocks necessary for wireless communication in the user terminal 20.

The baseband signal processing section 204 included in the user terminal 20 includes at least a control section 401, a transmission signal generation section 402, a mapping section 403, a received signal processing section 404, and a measurement section 405. These components may be included in the user terminal 20, or a part or all of the components may not be included in the baseband signal processing section 204.

The control unit 401 performs overall control of the user terminal 20. The control unit 401 can be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present disclosure.

Control section 401 controls generation of a signal in transmission signal generation section 402, allocation of a signal in mapping section 403, and the like, for example. Further, the control unit 401 controls reception processing of signals in the received signal processing unit 404, measurement of signals in the measurement unit 405, and the like.

Control section 401 acquires the downlink control signal and the downlink data signal transmitted from radio base station 10 from received signal processing section 404. Control section 401 controls generation of an uplink control signal and/or an uplink data signal based on a downlink control signal and/or a result of determination of necessity or unnecessity of retransmission control for a downlink data signal.

The control unit 401 may calculate PH (Power Headroom) corresponding to a predetermined uplink signal.

The control unit 401 may also decide a step size of a PH value per increment of an index (PH field) related to a PH or a range of PH values corresponding to the index based on a prescribed condition. Control section 401 may determine P based on a predetermined condition_CMAX，cRelative index (P)_CMAX，cFields) per increment of P_CMAX，cStep size of the value of (a) or P corresponding to the index_CMAX，cA range of values of (c). These predetermined conditions may be the determination conditions shown in (1) to (6) of the above-described embodiment. In addition, "decision" can also be interpreted as "assumption (assumption)".

Control section 401 may also perform control of transmitting a PHR (Power Headroom Report) including the above-described index.

For example, control section 401 may determine the step size or range based on specific bits of the PHR MAC CE used for transmission of the PHR.

Control section 401 may determine the step size or the range based on the band used by transmitting/receiving section 203.

The control unit 401 may also be based onFor P corresponding to PH field_CMAX，cValue of (P)_CMAX，cP indicated by field_CMAX，cThe value of (d) to determine the step size or range.

The control unit 401 may also decide the step size or the range based on the capability of the user terminal.

Control section 401 may determine the step size or the range based on the maximum transmission power for each cell group set in the user terminal.

Control section 401 may determine the step size or the range based on explicit signaling from radio base station 10.

Further, when various information notified from the radio base station 10 is acquired from the received signal processing unit 404, the control unit 401 may update the parameters for control based on the information.

Transmission signal generating section 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, and the like) based on an instruction from control section 401, and outputs the uplink signal to mapping section 403. The transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common knowledge in the technical field of the present disclosure.

Transmission signal generating section 402 generates an uplink control signal related to transmission acknowledgement information, Channel State Information (CSI), and the like, for example, based on an instruction from control section 401. Transmission signal generation section 402 also generates an uplink data signal based on an instruction from control section 401. For example, when the UL grant is included in the downlink control signal notified from radio base station 10, transmission signal generating section 402 is instructed from control section 401 to generate the uplink data signal.

Mapping section 403 maps the uplink signal generated by transmission signal generating section 402 to a radio resource based on an instruction from control section 401, and outputs the result to transmitting/receiving section 203. The mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common knowledge in the technical field related to the present disclosure.

Received signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmission/reception section 203. Here, the reception signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, and the like) transmitted from the radio base station 10. The reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present disclosure. Further, the received signal processing unit 404 can constitute a receiving unit according to the present disclosure.

The received signal processing unit 404 outputs information decoded by the reception processing to the control unit 401. Received signal processing section 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to control section 401. Further, the received signal processing unit 404 outputs the received signal and/or the signal after the reception processing to the measurement unit 405.

The measurement unit 405 performs measurements related to the received signal. The measurement unit 405 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present disclosure.

For example, measurement section 405 may perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 405 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and so on. The measurement result may also be output to the control unit 401.

(hardware construction)

The block diagram used in the description of the above embodiment shows blocks in functional units. These functional blocks (constituent units) are realized by any combination of hardware and/or software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by 1 apparatus physically and/or logically combined, or may be implemented by a plurality of apparatuses by directly and/or indirectly (for example, by wire and/or wirelessly) connecting 2 or more apparatuses physically and/or logically separated.

For example, the radio base station, the user terminal, and the like in one embodiment may function as a computer that performs processing of the radio communication method of the present disclosure. Fig. 9 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to an embodiment. The radio base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following description, the expression "device" may be interpreted as a circuit, an apparatus, a unit, or the like. The hardware configurations of the radio base station 10 and the user terminal 20 may include 1 or more of each illustrated device, or may not include some of the devices.

For example, the processor 1001 is only illustrated as 1, but a plurality of processors may be provided. Further, the processing may be performed by 1 processor, or may be performed by 1 or more processors simultaneously, sequentially, or otherwise. Further, the processor 1001 may be implemented by 1 or more chips.

Each function of the radio base station 10 and the user terminal 20 is realized by, for example, reading predetermined software (program) into hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs an operation to control communication via the communication device 1004 or to control reading and/or writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the baseband signal processing unit 104(204), the call processing unit 105, and the like can be implemented by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, and the like from the storage 1003 and/or the communication device 1004 to the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be similarly realized for other functional blocks.

The Memory 1002 may be a computer-readable recording medium including at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), or the like. The memory 1002 can store a program (program code), a software module, and the like that are executable to implement the wireless communication method according to the embodiment.

The storage 1003 may be a computer-readable recording medium, and may be configured by at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, an optical disk (e.g., a Compact Disc (CD-ROM) or the like), a digital versatile Disc (dvd), a Blu-ray (registered trademark) disk (Blu-ray Disc)), a removable disk (removable Disc), a hard disk drive, a smart card (smart card), a flash memory device (e.g., a card (card), a stick (stick), a key drive (key drive)), a magnetic stripe (stripe), a database, a server, or other suitable storage medium. The storage 1003 may also be referred to as a secondary storage device.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via a wired and/or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like, for example. The communication device 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like in order to realize Frequency Division Duplexing (FDD) and/or Time Division Duplexing (TDD), for example. For example, the transmission/ reception antennas 101 and 201, the amplifier units 102 and 202, the transmission/ reception units 103 and 203, the transmission line interface 106, and the like described above may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Further, the processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be formed by a single bus, or may be formed by different buses between the respective devices.

The radio base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), or the like, and some or all of the functional blocks may be implemented by the hardware. For example, the processor 1001 may also be implemented with at least 1 of these hardware.

(modification example)

In addition, terms described in the specification and/or terms necessary for understanding the specification may be replaced with terms having the same or similar meanings. For example, the channels and/or symbols may also be signals (signaling). Further, the signal may also be a message. The reference signal may also be referred to as rs (reference signal) for short, and may also be referred to as Pilot (Pilot), Pilot signal, or the like, depending on the applied standard. Further, a Component Carrier (CC) may also be referred to as a cell, a frequency Carrier, a Carrier frequency, and the like.

The radio frame may be constituted by 1 or more periods (frames) in the time domain. Each of the 1 or more periods (frames) constituting a radio frame may also be referred to as a subframe. Further, the subframe may be formed of 1 or more slots in the time domain. The subframe may also be a fixed time length (e.g., 1ms) independent of a parameter set (Numerology).

Further, the slot (slot) may be formed of 1 or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, or the like). Further, the time slot may also be a time unit based on a parameter set. In addition, a timeslot may also contain multiple mini-timeslots. Each mini slot (mini slot) may be formed of 1 or more symbols in the time domain. Further, a mini-slot may also be referred to as a sub-slot.

Any of a radio frame, a subframe, a slot, a mini slot (mini slot), and a symbol represents a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot and symbol may be referred to by other names corresponding to each. For example, 1 subframe may also be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot or 1 mini-slot may also be referred to as TTIs. That is, the subframe and/or TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, instead of a subframe.

Here, the TTI refers to, for example, the smallest time unit of scheduling in wireless communication. For example, in the LTE system, the radio base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like usable by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, and/or code word, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, the time interval (e.g., the number of symbols) in which the transport block, code block, and/or codeword is actually mapped may also be shorter than the TTI.

When 1 slot or 1 mini-slot is referred to as TTI, 1 or more TTI (i.e., 1 or more slot or 1 or more mini-slot) may be the minimum time unit for scheduling. The number of slots (mini-slots) constituting the minimum time unit of the schedule may be controlled.

The TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in LTE Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, or the like. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, or the like.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.

A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include 1 or more consecutive subcarriers (subcarriers) in the frequency domain. In addition, the RB may include 1 or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of the 1 TTI and 1 subframe may be formed of 1 or more resource blocks. In addition, 1 or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, and the like.

In addition, a Resource block may be composed of 1 or more Resource Elements (REs). For example, 1 RE may also be a radio resource region of 1 subcarrier and 1 symbol.

The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations can be variously changed.

The information, parameters, and the like described in the present specification may be expressed as absolute values, relative values to predetermined values, or other corresponding information. For example, the radio resource may be indicated by a predetermined index.

In the present specification, the names used for parameters and the like are not limitative names in all aspects. For example, various channels (PUCCH (Physical Uplink Control Channel)), PDCCH (Physical Downlink Control Channel), and the like) and information elements can be identified by any appropriate names, and thus various names assigned to these various channels and information elements are not limitative names in all aspects.

Information, signals, and the like described in this specification can be expressed using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Information, signals, and the like may be output from a higher layer (upper layer) to a lower layer (lower layer) and/or from a lower layer (lower layer) to a higher layer (upper layer). Information, signals, and the like may be input and output via a plurality of network nodes.

The input/output information, signals, and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. The input/output information, signals, and the like may be rewritten, updated, or added. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The information notification is not limited to the embodiments and modes described in the present specification, and may be performed by other methods. For example, the Information may be notified by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI), higher layer signaling (e.g., RRC (Radio Resource Control)) signaling, broadcast Information (Master Information Block, SIB (System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

In addition, physical Layer signaling may also be referred to as L1/L2 (Layer 1/Layer 2)) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. The RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. Further, the MAC signaling may be notified using, for example, a MAC Control Element (MAC CE (Control Element)).

Note that the notification of the predetermined information (for example, the notification of "yes X") is not limited to an explicit notification, and may be performed implicitly (for example, by not notifying the predetermined information or by notifying another information).

The determination may be performed based on a value (0 or 1) represented by 1 bit, may be performed based on a true or false value (boolean value) represented by true (true) or false (false), or may be performed by comparison of values (for example, comparison with a predetermined value).

Software, whether referred to as software (software), firmware (firmware), middleware (middle-ware), microcode (micro-code), hardware description language (hardware descriptive term), or by other names, should be broadly construed as meaning instructions, instruction sets, code (code), code segments (code segments), program code (program code), programs (program), subroutines (sub-program), software modules (software modules), applications (application), software applications (software application), software packages (software packages), routines (routine), subroutines (sub-routine), objects (object), executables, threads of execution, procedures, functions, and the like.

Software, instructions, information, and the like may also be transmitted or received via a transmission medium. For example, where the software is transmitted from a website, server, or other remote source (remote source) using wired and/or wireless technologies (e.g., coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technologies (infrared, microwave, etc.), such wired and/or wireless technologies are included within the definition of transmission medium.

The terms "system" and "network" are used interchangeably throughout this specification.

In the present specification, terms such as "Base Station (BS)", "radio Base Station", "eNB", "gNB", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. In some cases, a base station is also referred to by terms such as a fixed station (fixed station), NodeB, eNodeB (eNB), gNB, access point (access point), transmission point, reception point, femto cell, small cell, and the like.

A base station can accommodate 1 or more (e.g., 3) cells (also referred to as sectors). In the case where a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (e.g., a small-sized indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of a base station and/or base station subsystem that is in communication service within the coverage area.

In this specification, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", and "terminal" are used interchangeably. In some cases, a base station is also referred to by terms such as a fixed station (fixed station), NodeB, eNodeB (eNB), access point (access point), transmission point, reception point, femto cell, small cell, and the like.

In some cases, those skilled in the art will also refer to a mobile station as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communications device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or several other appropriate terms.

The radio base station in this specification may be interpreted as a user terminal. For example, the aspects/embodiments of the present disclosure may also be applied to a configuration in which communication between a wireless base station and a user terminal is replaced with communication between a plurality of user terminals (Device-to-Device (D2D)). In this case, the user terminal 20 may have the functions of the radio base station 10 described above. The expressions such as "upstream" and "downstream" can also be interpreted as "side". For example, the uplink channel can also be interpreted as a side channel (side channel).

Similarly, the user terminal in this specification can be interpreted as a radio base station. In this case, the radio base station 10 may be configured to have the functions of the user terminal 20 described above.

In this specification, the operation performed by the base station may be performed by an upper node (upper node) depending on the case. It is apparent that in a network including 1 or more network nodes (network nodes) having a base station, various operations performed for communication with a terminal may be performed by the base station, 1 or more network nodes other than the base station (considering, for example, but not limited to, an MME (Mobility Management Entity), an S-GW (Serving-Gateway), and the like), or a combination thereof.

The embodiments and modes described in the present specification may be used alone, may be used in combination, or may be used by switching with execution. Note that, the order of the processing procedures, the sequence, the flowcharts, and the like of the embodiments and the embodiments described in the present specification may be changed as long as they are not contradictory. For example, elements of various steps are presented in the order of illustration for the method described in the present specification, but the present invention is not limited to the specific order presented.

The aspects/embodiments described in the present specification may also be applied to LTE (Long Term Evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (fourth generation Mobile communication System), 5G (fifth generation Mobile communication System), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New Radio Access), FX (New Radio Access), GSM (Global System for Mobile communication), and CDMA (Radio Broadband) System (Global System for Mobile communication), and CDMA (CDMA 2000 Mobile communication System)) IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using another appropriate wireless communication method, and/or a next-generation system expanded based on these.

The term "based on" used in the present specification does not mean "based only on" unless otherwise specified. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to an element using the designations "first", "second", etc. used in this specification does not fully define the amount or order of such elements. These designations may be used herein as a convenient way to distinguish between 2 or more elements. Thus, reference to first and second elements does not imply that only 2 elements may be used or that the first element must somehow override the second element.

The term "determining" used in the present specification includes various actions in some cases. For example, "determination (determination)" may be regarded as a case where "determination (determination)" is performed for calculation (computing), processing (processing), derivation (deriving), investigation (analyzing), search (logging) (for example, search in a table, a database, or another data structure), confirmation (intercepting), and the like. The "determination (decision)" may be regarded as a case of "determining (deciding)" on reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like. The "determination (decision)" may be regarded as a case where the "determination (decision)" is performed for solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like. That is, "judgment (decision)" may also be regarded as a case where "judgment (decision)" is performed on some actions.

The terms "connected" and "coupled" or all variations thereof used in the present specification mean all connections or couplings, directly or indirectly, between 2 or more elements, and can include a case where 1 or more intermediate elements exist between 2 elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may also be interpreted as "access".

In the present specification, when 2 elements are connected, it can be considered that the elements are "connected" or "coupled" to each other using 1 or more electric wires, cables, and/or printed electric connections, and using electromagnetic energy having a wavelength in a radio frequency region, a microwave region, and/or a light (both visible and invisible) region, or the like as a few non-limiting and non-inclusive examples.

In the present specification, the term "a is different from B" may mean "a is different from B". The terms "separate", "combine", and the like are also to be construed similarly.

Where the terms "comprising", "including", and "comprising" and variations thereof are used in either the description or the claims, these terms are intended to be inclusive in the same way as the term "comprising". Further, the term "or" as used in the specification or claims does not mean exclusive or.

Although the invention according to the present disclosure has been described in detail above, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present specification. The invention according to the present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the invention according to the present disclosure.

Claims (6)

1. A user terminal, comprising:

a control unit that determines, based on a predetermined condition, a PH value per increment of an index relating to PH, that is, a power headroom, or a PH value range corresponding to the index; and

and a transmitting unit for transmitting the PHR including the index, i.e., the power headroom report.

2. The user terminal of claim 1,

the control unit decides the step size or the range based on a specific bit of a PHR MAC CE, i.e., a medium access control element, used for transmission of the PHR.

3. The user terminal of claim 1,

the control unit decides the step size or the range based on the band utilized by the transmission unit.

4. The user terminal of claim 1,

the control unit is based on P corresponding to the PH-related index_CMAX，cThe step size or the range.

5. The user terminal of claim 1,

the control unit decides the step size or the range based on the capability of the user terminal.

6. The user terminal of claim 1,

the control unit determines the step size or the range based on a maximum transmission power per cell group set to the user terminal.

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